Having something intentionally non-essential to cut is much better than discovering under pressure that everything is load-bearing

It’s also an old devops trick to put some GB files on the FS of critical systems (databases, ..) when there are no way to dynamically add more space/volumes and monitoring is not trusted.

Bit hard to explain though.

I think sacrificial ballast would be a good term, https://en.wikipedia.org/wiki/Ballast